Originally Posted by simplechamp

bdebde is probably right, the other guys motors probably couldn't be repaired (or it wasn't cost effective, e.g. worth it for Castle to bother with) so they got new ones. Yours most likely had an issue that could be repaired and that's what they most likely did.

I do agree with What's_nitro, you can't really complain about warrantying your item and getting back the same thing you sent in. I would see getting the new version as a bonus if it worked out that way, not something to be expected. If you were concerned about what you would get back, or wanted to find out if you could get the newer version contacting Castle would have been the thing to do.